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H10MO-480, H10MO-240, H10MO-120
Fiber Optic Modem
User Manual
Revision 1.0
2002/4
1.
INTRODUCTION .......................................................................................................... 1
2.
SYSTEM ARCHITECTURE ........................................................................................ 1
3.
4.
5.
2.1.
BLOCK DIAGRAM ..................................................................................................... 1
2.2.
FUNCTIONAL UNITS ................................................................................................. 2
2.3.
PANEL ARRANGEMENT............................................................................................. 3
2.4.
LOOP BACKS ............................................................................................................ 3
INSTALLATION ........................................................................................................... 4
3.1.
MECHANICAL........................................................................................................... 4
3.2.
ELECTRICAL ............................................................................................................ 4
3.2.1.
Power connection............................................................................................... 4
3.2.2.
E1 connection..................................................................................................... 5
3.2.3.
Fiber connection ................................................................................................ 6
3.2.4.
Grounding .......................................................................................................... 7
3.2.5.
Order wire.......................................................................................................... 7
3.2.6.
Alarm output ...................................................................................................... 7
3.2.7.
Remote management .......................................................................................... 7
3.2.8.
AUX data channels............................................................................................. 8
OPERATION AND MAINTENANCE......................................................................... 8
4.1.
SWITCH-ON CHECKS................................................................................................. 8
4.2.
SOFTWARE MONITOR AND CONTROL ...................................................................... 10
4.3.
LED’S ................................................................................................................... 11
SPECIFICATIONS ...................................................................................................... 12
5.1.
CAPACITY .............................................................................................................. 12
5.2.
OPTICAL INTERFACE .............................................................................................. 12
5.3.
E1 INTERFACE ........................................................................................................ 13
5.4.
MANAGEMENT INTERFACE..................................................................................... 13
5.5.
AUX DATA ............................................................................................................ 13
5.6.
ALARM PORT ......................................................................................................... 13
5.7.
POWER ................................................................................................................... 14
5.8.
WORKING ENVIRONMENT ...................................................................................... 14
5.9.
DIMENSION ............................................................................................................ 14
Note: Every effort is made to ensure that material printed in this manual is
accurate until release. However we reserve the right to make improvements
without prior notice.
H10MO-480, H10MO-240, H10MO-120
Fiber Optic Modem
User Manual
1. Introduction
The H10MO-480 (-240, -120) fiber optic modem is designed to provide
transmission of 16 (8,4) E1 channels over a fiber optic connection. Based on an
internally developed ASIC, HMX3101, which integrates M12 and M23
multiplexers, E1 clock recovery units, digital PLLs, E1 cross connection,
microcontroller interface, and other functional blocks in a single chip, the
modem features compactness, light weight, low power consumption and high
reliability.
To ease the operation and maintenance effort, each H10MO-480 (-240、
-120) device has a built-in microcontroller unit, which allows remote
supervision and control through a network management software running on a
PC. For customers not equipped with the management software, a number of
LEDs on the front panel are available for status and alarm indications. Local and
remote loop back control can also be performed with panel dip switches.
H10MO devices operate on 1.3µm lasers, with a typical transmission
distance of 40 km over single mode optical fibers. For longer hops, 1.5µm laser
sources may be selected.
Apart from 16 (8, 4) E1 channels, the H10MO fiber optic modem also
provides a RS232 and a RS485 asynchronous data channel, as well as an order
wire telephone subsystem.
Except power supply, all the functional blocks are integrated on a single PC
board, which makes the modem compact and reliable. 220 V AC or -48 V DC
power options are available by selecting an appropriate plug-in power unit. In
the case of -48 V DC power supply, two plug-in units may be installed for
redundancy. The device enclosure is a standard 19” wide 1U metal box, suitable
for rack mounting, or as a desk top unit.
2. System Architecture
2.1. Block diagram
The functional block diagram of H10MO-480 optical modem is given
H10MO Fiber Optic Modem User Manual
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below:
HDB3x16
SV port
RS232
RS485
E1
inerface
uP
unit
E1x16
power in
uP interface
M13
MUX/DMUX
power
unit
+5V
E3
AUX
data unit
line unit
O/E
interface
OW unit
Fig. 1 Block diagram of H10MO-480
The functional block diagram for H10MO-240 and H10MO-120 systems
are identical to that of H10MO-480, except the E1 channel capacity.
2.2. Functional Units
The core of the H10MO modem is the M13 mux/dmux unit, which is
realized with a single ASIC device, HMX3101. The device multiplexes 16 (8, 4)
PDH E1 (2048kbps) tributary data streams into a single E3 (34368kbps) signal,
and vice versa.
E1 interface unit interfaces the HDB3 E1 signal to the HMX3101 ASIC,
and performs impedance matching and line equalization functions. 75 Ω or
120Ω impedance can be selected.
Built-in micro controller unit sets the operation mode of the HMX3101
ASIC, reads alarm status, calculates bit error rate, and communicates with the
network management system for remote supervision.
The functions of the order wire unit include telephone hand set interface,
voice coding and decoding, signaling and ringing.
AUX data unit provides RS232 and RS485 interfaces for two transparent,
rate free asynchronous data channels.
O/E interface unit transfers between electronic signal and optical signal for
line transmission. Optical signal loss detection, clock and data recovery are also
achieved in this unit.
Line unit is used for clock translation, framing, AUX channel insertion, line
coding, bit error detection functions.
Power unit converts 220V AC or –48V DC supply into 5V internal power.
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H10MO Fiber Optic Modem User Manual
2.3. Panel arrangement
The front panel of H10MO-480 optical modem is as shown below:
RLB DIP SWITCH
10-3 BER
ALARM MASK DIP
OW PHONE JACK
CALL
INDICATION
SV INTERFACE
RS232
LLB DIP SWITCH
10-6 BER
E1LOS GROUP-A
+5V POWER
MAIN
PROTECTION
LOOP BACK
REMOTE ALARM
E3 LOS OF FRAME
E1LOS GROUP-B
-48V SWITCH
E1LOS GROUP-C
BELL OFF BUTTEN
LOS OF OPTICAL
SIGNAL
E1LOS GROUP-D
Fig. 2 Front panel
As indicated, the 16 E1 ports provided by H10MO-480 are divided into 4
groups, labeled A, B, C, and D. Each group contains 4 E1 interface ports. An
H10MO-240 modem provides only group A and B with 8 E1 ports, and an
H10MO-120 modem provides only group A with 4 E1 ports.
The rear panel of H10MO modem is shown below:
Protection ground
Output fiber
connector
power chamber
Alarm out and bell-off
SV RS485 port
E1 interface
-48 power in
AUX RS232 port
Input fiber
connector
AUX RS485 port
Bus termination for SV RS485
Fig. 3 Rear panel
2.4. Loop backs
The H10MO modems support panel dip switch control of loop backs to
allow for installation and maintenance checks. Remote loop back (RLB) and
local loop back (LLB) control results in loop backs as shown below:
H10MO Fiber Optic Modem User Manual
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LLB
RLB
E1
E1
local
unit
remote
unit
Fig. 4 local and remote loop backs
3. Installation
3.1. Mechanical
The dimension of the H10MO fiber optic modem is shown below:
435mm
244mm
44.45mm
31.8mm
465mm
482mm
Fig. 5 Mechanical dimension
3.2. Electrical
3.2.1. Power connection
Plug-in power unit is installed inside the power chamber. Two types of
power units are available, 220V ac, or –48V dc.
When ac unit is installed, the power inlet, a fuse, and a switch are
integrated with the unit , as shown in the diagram below.
fuse
switch
N
L
E
inlet
Fig. 6 AC power module
Use the power cord supplied with the modem unit. Plug in the power cord
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H10MO Fiber Optic Modem User Manual
to the ac power inlet at the back of the power chamber. Be sure to use a wall
outlet with correct voltage and a secure earth connection.
If –48V dc power is selected, 1 or 2 DC/DC converter cards are installed in
the power chamber according to purchase options. A cover plate is fixed on the
chamber by screws. –48V dc power connector is on the right side of the power
chamber as shown below.
PWR CHAMBER
PWRIN
release
lever
V GND
Fig. 7 DC power connector
Connect the modem to –48V power source using a pair of wires about 1mm
in diameter to the power-in connector. Remove about 10mm of the protective
insulator from the wire end. Prepare the wire end with solder. Push inward the
yellow release lever on top of the connector with a screw driver, plug the
prepared wire end well into the hole, then release the push. Note that the left
hole is for –48 supply, and the right hole is for ground.
3.2.2. E1 connection
According to the number of E1 ports and their impedance, different E1
interface adapters are used on different modem units.
A 75Ωcoaxial E1 interface adapter is shown below:
A-IN
B-IN
C-IN
D-IN
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
A-OUT
B-OUT
C-OUT
D-OUT
Fig. 8 Coaxial 75Ω E1 interface adapter
The outer conductors of the output jacks are earthed, while the input jacks
are floating. H10MO-480 modems contain all the jacks, H10MO-240 modems
have group A and group B jacks, while only group A jacks are available on
H10MO-120 modems.
120Ω balanced E1 ports use either wire wrapping pins or D-type
connectors for E1 signal connection. A wire wrapping adapter is shown below:
H10MO Fiber Optic Modem User Manual
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A-IN
B-IN
C-IN
D-IN
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
A-OUT
1 2 3 4
1 2 3 4
1 2 3 4
B-OUT
C-OUT
D-OUT
Fig. 9 Wire wrapping 120Ω E1 interface adapter
In the diagram, the pins near the edge of the adapter are for shielding, and
the rest are signal pins. As with the coaxial adapter, different number of E1 port
groups are available for -120, -240, and -480 type of modems.
A D-type connector based adapter is shown below:
A-IN
B-IN
C-IN
D-IN
A-OUT
B-OUT
C-OUT
D-OUT
Fig. 10 D-connector 120Ω E1 interface adapter
Each 9-pin D-type connector connects two E1 ports, and the signal
definition is given in the following table:
Table 1 E1 connector pin definition
Pin No.
Signal
Port
1,shell
ground
2,6
in
E1-1
3,7
out
4,8
in
E1-2
5,9
out
The user should prepare the connectorized cables according to the above
table for the D-type connector adapter.
3.2.3. Fiber connection
Use FC type connectors to connect the fiber optic modem to the
transmission cable. Pay attention to the input and output relationship. Do not
bend fiber to sharp angles to prevent damage. Do not look directly into the
fiber end or the Tx connector socket for extended time, it may be harmful
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H10MO Fiber Optic Modem User Manual
to the eyes.
3.2.4. Grounding
Fasten a wire to the protection ground connector screw, which is on the
rightmost side of the rear panel. Connect the wire to the shielding ground.
3.2.5. Order wire
The order wire telephone jack is on the left side of the front panel. Any
standard 2-wire telephone set with a RJ11 connector may be used. Note that the
ringing current is not sent to the telephone set. Instead, a buzzer is inside the
modem to signal the incoming call.
The OW telephone works in hot line mode. When one end picks up, the
other end rings. There is a visual incoming call indicator LED to the left of the
phone jack in order to identify the ringing modem, in case more than one are
installed in close proximity.
3.2.6. Alarm output
An alarm and bell-off signal socket is at the right side of the rear panel. The
left pin is alarm output, which floats when the modem works normally, and
connects to shielding ground to indicate alarm conditions. The right pin is for
terminating the alarm bell sound. It floats normally, but connects to shielding
ground when Bell-off button on the front panel is pushed down. This is useful
only if the system is used with a rack-top alarm unit.
3.2.7. Remote management
For customers who purchased the management software package, H10MO
fiber optical modems can be remotely managed by a PC. With each software
package, a RS232 to RS485 converter is supplied. Plug the converter to a COM
port on the PC, and make a RS485 cable according to the following table:
Table 2: RS485 cable definition
#
PC
1
2
3
connector
type
DB-9-F
DB-9-F
DB-9-F
DB-9-F
Length
(m)
NA
(e.g. 10)
(e.g. 0.2)
(e.g. 0.2)
TxP
pin
3
2
2
2
TxN
pin
4
3
3
3
RxP
pin
1
4
4
4
RxN shell
pin
2
√
5
√
5
√
5
√
Connectors are connected together in parallel by a 5-wire cable. Pin
numbers for each connector listed in the same column are attached to the same
wire. The number of entries (connectors) in the table depends on the number of
H10MO Fiber Optic Modem User Manual
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H10MO devices installed for remote control, and the length of cable sections
between connectors is determined by the user, based on the positional
relationship between the PC and the modems.
In the Table 2 example, 3 pairs of H10MO modems are controlled by a PC,
as depicted in the following figure.
C
P
RS232/RS485
converter
1
2
3
H10MO
H10MO
H10MO
PC
local
1
remote
H10MO
2
H10MO
3
H10MO
Fig. 11 Remote control of H10MO modem pairs
The connector labeled PC is connected to the RS232/RS485 converter
attached to a COM port on the PC, and the connectors labeled 1,2,3 are
connected to the SV RS485 ports on each modem.
To the right of SV RS485 socket on each modem, there is a termination dip
switch. If the modem is at the end of the RS485 cable, e.g. No.3 in Fig. 11, the
switch dips should be pressed down, otherwise, they should be lift up. Do not
confuse the SV RS485 socket with the AUX RS485 socket when making the
connection.
The RS232 socket on the front panel is used for local connection.
3.2.8. AUX data channels
The AUX data ports are used to provide 2 transparent asynchronous serial
data channels with line rate up to 100kbps. One port interface is RS232, and the
other , RS485. Both use 9-pin D-type connectors on the rear panel, and the
pin-signal relationship is given in the table below.
Table 3: AUX data channel interface connector definition
PIN No.
RS232
RS485
2
Rx
TxP
3
Tx
TxN
4
RxP
5
GND
RxN
shell
shield
shield
4. Operation and maintenance
4.1. Switch-on checks
When all the connections are down, switch on the unit. Observe all the
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H10MO Fiber Optic Modem User Manual
alarm LED’s for any possible installation errors. Check the output optical
power using an optical power meter. The reading should be within specification.
Measure the optical power at the receiver end. Make sure that the power
level is between the maximum allowable input power and sensitivity given in
the specification. It is preferred to leave a margin of few dB’s for stable
operation.
If all the alarm LED’s are correct (refer to section 4.3 for description of the
alarm LED’s), try to contact the other end using the order wire telephone.
Successful conversation means that the modem is working normally.
If software management is required, each modem pair should be given a
unique network address. In addition, the local unit should be set to a node
address of 0, and the remote be set to 1. The address setting is down through SV
RS232 port, and will be kept in non-volatile memory. If software management
is not used, address setting is not required.
Press down the local loop back (LLB) dip switch at the front panel, the
yellow LB LED lights up. Measure any E1 channel using a bit error rate tester,
no error should present. Cancel the LLB. If the remote end is already
operational, press down the remote loop back (RLB) dip, measure any E1
channel, no error should be found. Cancel the RLB, and the modem pair should
operate normally.
Connect all the E1 signals to the appropriate E1 ports, check the operation
of the services provided by these E1 channels.
When all the service are setup correctly, and there are spare E1’s available,
those unconnected E1’s will result in “loss of E1 signal” alarms, which will be
indicated by appropriate LED’s, and the system alarm port will report this alarm
condition. Since these are not real defects, they can be suppressed by setting an
alarm mask by press down the alarm mask control dip switch on the front panel
(ALM-MSK). Thus, the spare E1’s will not lit E1 LOS LED lights, nor there
will be system alarm output. Only newly appeared defects affecting normal
operation will then cause alarms.
After alarm mask setting, if the dip switch is lifted up, all the unconnected
E1’s will still cause their respective LOS LED’s to light up, so that the operator
can observe which E1 ports are available, but system alarm output remains
masked. The alarm mask is stored in non-volatile memory, and will remain
valid even after power off. Note that the alarm mask cannot be unset. If
operation condition changes, for example, a spare E1 is put into service, then
one must re-apply the mask setting to reflect the change. Otherwise, the loss of
that added E1 signal will not cause alarm.
H10MO Fiber Optic Modem User Manual
-9-
4.2. Software monitor and control
H10MO fiber optic modems can be managed by the H7GMSW
management software, running on a PC platform. See operation manual of
H7GMSW for operation of the software package. Only the details specific to
H10MO modems are given here.
The H10MO modem is represented by the following icon in the graphical
management window. When any alarm condition is present, the icon flashes.
Fig. 12 Screen icon of H10MO modem
Double click the icon brings out the following window.
Status
Setting box
Response
Control button
Fig. 13 Management window for an H10MO modem
Monitoring and control is performed through this window. In the window,
there are status circles, setting boxes, response boxes, and control buttons.
Status circle indicates a specific status, including alarm and current loop back
setting, by showing a dot inside the circle. Setting box is used to select loop
back of specific channel and type. Control button is for carrying out the
selected loop back, or close the window. Response box indicates, by showing a
cross in the box, response from the modem under control after a control button
is pressed.
For example, if a solid dot appears within the status circle at the cross
section of row 2MD4 and LLB column, it means that the No.4 E1 in E1 group D
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H10MO Fiber Optic Modem User Manual
is set to local loop back.
Note that RLB and LLB here refer to a specific port / line, not the location
of a modem unit in a local or remote site, as depicted below:
equipment
line
equipment
line
remote end loop back
RLB
local end loop back
LLB
Fig. 14 Loop back definition
To set a specific port loop back, move the mouse cursor to the appropriate
setting box, click to bring up a check sign, and click the “E1 loop back control”
button. Any number of E1 loop backs can be set with a single control. To
remove a loop back, click the setting box to remove the check sign, and click the
“E1 loop back control” button again. The E3 local loop back is controlled by
“E3 loop back control” button. Note that the E3 loop back can only be set at the
local modem, but not to the remote, otherwise the loop back will block the data
communication channel, and there will be no way to remove the loop back.
Following monitoring and control can be performed on H10MO modems
through the management software:
Los of signal at any E1 port
Alarm indication (AIS) at any E1 port
Loop back status and types (LLB or RLB) of each E1 port ,control of
loopbacks
Los of incoming optical signal
Bit error rate over 10 −3 （1E-3）, or between 10 −3 and 10 −6 （1E-6）
E3 loss of frame
E3 AIS
E3 loop back （34M LLB）status and control
5V power module failure (if protection is available)
4.3. LED’s
There are reach LED’s on the front panel of the H10MO modem. The
H10MO Fiber Optic Modem User Manual
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following table lists meaning of all the LED’s and possible causes .
Table 4: LED description
LED
+5V(A)
+5V(B)
E1LOS
OLOS
E3LOF
RA
1E-3
1E-6
color
Meaning when lit
green +5V output OK
Possible cause
Off: power module failure / power module not
installed
+5V(A) the main power
+5V(B) the protection power
red E1 signal loss
On: spare E1 /cable defect / up stream failure /
16 in 4 groups
input circuit failure
Off when E1 is applied: alarm mask set / input
circuit failure
red Los of optical signal
On: remote switched off / broken fiber/
excessive connection loss / remote laser failure /
local receive module failure
red E3 loss of frame
On: excessive transmission error / remote unit
failure / local unit failure
yellow Remote alarm
On: remote OLOS / remote 1E-3 BER / remote
E3LOF
red Bit error rate greater than On: excessive connection loss / remote laser
ageing / local receiver ageing / excessive
10 −3
incident optical power
yellow Bit error rate greater than Same as above
10 −6
LB
CALL
yellow Loop back on
On: LLB dip pressed down / remote RLB dip
pressed down / some ports set to loop back
mode through software control
green Remote OW phone off-hook
Note:
Loop back control switch is not position sensitive, a command is issued
only at the moment when the dip is pressed down. Turning on the unit with the
dip down does not activate loop back.
Loop back status is not preserved after power off.
When setting alarm mask, all the loop back will be canceled.
When BER is greater than 10−2 , 1E-3 and 1E-6 LED’s will be turned on at
the same time.
5. Specifications
5.1. Capacity
H10MO-480: 16 E1 PDH signals at 2.048Mbps
H10MO-240: 8 E1 PDH signals at 2.048Mbps
H10MO-120: 4 E1 PDH signals at 2.048Mbps
5.2. Optical interface
Line rate:
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41241.6kbps
H10MO Fiber Optic Modem User Manual
Line code:
Wavelength:
Scrambled NRZ
1.3μｍ(typical)
1.5μｍ(optional)
Optical source: LD
Optical receiver: PIN-FET
Connector:
FC
Optical budget:
≥22dB (typical)
29dB...35dB (optional)
Maximum input power:
-3dBm
5.3. E1 interface
Bit rate:
Line code:
Impedance:
2048kbps±50ppm
HDB3
75Ω (unbalanced) or 120Ω (balanced)
5.4. Management interface
Main interface:
RS485, 2400 bps, TABS protocol
Data bits: 8, Stop bits: 1, Parity: odd
9 pin D type connector
Note book interface:
RS232, 2400 bps, TABS protocol
Data bits: 8, Stop bits: 1, Parity: odd
9 pin D type connector
5.5. AUX data
RS232:
3 line (Tx,Rx,GND) asynchronous
0-100 kbps，9 pin D type connector
RS485
4-line (TxP,TxN,RxP,RxN) asynchronous
0-100 kbps，9 pin D type connector
5.6. Alarm port
System alarm out:
Bell off:
Ground when alarm, float otherwise
Ground when activated, float otherwise
H10MO Fiber Optic Modem User Manual
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5.7. Power
DC type:
AC type:
Power consumption:
±48V（-36V to -72V or 36V to 72V）
220V（165V~265V）
≤10W
5.8. Working environment
Temperature:
Humidity:
0 ~45°C
≤90% non condensing
5.9. Dimension
Width:
Height:
Deep:
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435mm
45mm
244mm
H10MO Fiber Optic Modem User Manual